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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddb5b3ed79c4d2c106bd24649227ce9df66b0a3810968ae67e3bb572765b1db' 
  AND token = 'uW3AFM0LN5Ejx6yMq99CHkqzjUp8aOhfKfJNc/4u8OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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