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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886c7885deb8ddca54729995c72d6f416c136f8ca5c94edf831b83dac07965a9' 
  AND token = 'YaEZIKoZRupEp8Y1W9fd3BFmygccCWTSzloY7E8Ytyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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