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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4001907a9a4b38c191ce9efaa22adf5e57cb5c94c14657440458d517685d2678' 
  AND token = 'V7TezN5gNhd31qdPgAClBhVGf3u9yr6WA0YpJ8Okpv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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