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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e748a368f5e67f493375fe9b0887823a5fa1784964835dbbed75e98b532563' 
  AND token = 'yD9T6t6oCxak0H9tRFf7uzVFQbpB9yxPVFhoE33w0IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00163

JSON explain

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