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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ad3e14b4a06e6a74b5bf8bb653074464d0cb6a498575a9d111d2ded8e4adc0' 
  AND token = 'r226T0MkGtJChfr16TofmSVHOyiYHNnENqNZGG7km5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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