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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe659174a898c17867a58bb1aaeadf36c70b66cda68101e59222bc536daaa00' 
  AND token = 'Cl0WwPSg1roIbyiWKvs1EN5d8Kt0FOSoRb+CH1yXNUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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