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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69163c6a31beaf2fd5f24321ec83e775ee58a35d4284a0043970fbd4c63a5e9' 
  AND token = 'DpIeJ+dkg0p9J+Q7uAAjGSJDrABNFMbJnRo57n4Zjgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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