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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dc6ee7ab8419a0659f9664e98aa79e32fb78de9691b99bac93410858e11e88' 
  AND token = 'pfdZdmiLZHqpCfnviOrhfUhND129LT0noGxk1YdAOjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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