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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27cc9ce98392aec8c2697b3111a4e2ccad6f302348b8a99a5f27b03df266b60' 
  AND token = '6wXaBhYXmtVLVWmBwbidvr7RZSci7bmN3DFFX6uKzco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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