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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20324f9d00be8a8903218564186ed77e5306dbcd72acfe07e338be916e07b75b' 
  AND token = 'JkXl/s1eUBhOA754L+TFlW4FsLgF4nWhWS/UjKAic/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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