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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c52f787f37761aca10c6d89df68f66daa4a4cb042cff27b8d4f897f1db4159e' 
  AND token = '5aNbNrRWoS7e7iZKSFrwlC1y38RHKRkPdVzSYA5U6/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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