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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e856c7cd4865848fb86f072a3b25862d839026db4b9f20bab99e8d06884427b' 
  AND token = 'oinTb28VGfXYrsw4GP10wjajfezNFTpdCA3NmAf3uHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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