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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4e5b3ed2c7b1b6c21699d31e82e16a45003adfbeded5e1fb52e314f945aeb1' 
  AND token = 'i6dE3cmi6o1D7Kc78o3u3ofRS3x8Vr1TgftkI7F5H4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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