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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54047481bf7b816dc5c69803663be2ea7bc5f2ab88d4532e13a1dd6b32005b32' 
  AND token = 'U2Rf9BYEvH9bVU/0g5bukJz0dKM5KqJcoaWz7bUyNxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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