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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6638846966e5cdcb024cb1a936dae719e031da46dd46701626fd0400a1ab6fff' 
  AND token = 'jLmMHmtL0QBTNFDknSXsS9LxpFQ/s4LizNHvEY6h/FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}