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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60eb642d24a19a6684b3488213199b5803992da02fb318b4640cf545380ff7d9' 
  AND token = 'KYtpWIis8a2Q5koDYpXqYfIKSpdV0P2i9v7VifxEZxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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