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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f93920b293e2562861c87d8e463cdaa935ead314312583d0d2647a0e996af5' 
  AND token = 'GHoWQiUQfwkj/OngS4ZSu8kWlxlO2n/DSmZA014aofs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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