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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5422d8ab12075b3d8a9d950e47310b4a8ebdd89c770d2c7d8c7cc78599d6a36' 
  AND token = 'cnln6Ycj5LJXrid3LaR2rbY/VG7NulwXP89HPFL8BdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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