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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4063908d1ee298c0712c1243ecc8a049cc7543a2823e050b044b1f65099f50ea' 
  AND token = 'r32YfGpGwirvEmpv5BcjQPsbpfmaHnMNggnsK76aOzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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