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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9da59a09f737e1f4d7cd6d89a9227c0a6cd9dcaffc55919858f8204ed1cb12' 
  AND token = 'pbMS2pumCktfrGp1aejTYI0fpv3j6ZhQJH5k3H1OEAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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