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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00736218290425151305312153d973a64468b41d237518f40c9d53e62981bfeb' 
  AND token = 'vkj63y7JW4D2Pt1EEeK2wOo+ksQaAtbuXngZ2iH0TFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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