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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd004f528dea40eb2dca05c942b97c05530022f086bc6aea6eac72bb3fb825f5c' 
  AND token = 'jFPMJH8PmRzz8XKym0++6MyoIEMJv2xzuF7Ds3GCBis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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