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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c2f14ed8314bdff7ca8c0147baa3ad85a19d7c0e69a11ca73a71b1a74f62f0' 
  AND token = 'nx0Q65bA5gIiXr3TiuemPYgfy7u7FrHmUcxcMDMtZIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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