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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5adf5c73f4c426356d08029102a4d7b5db0caf7648ab8e7a13645c6c6a4686' 
  AND token = 'bdnRWnOm2sYkG2ZQqy9irTVXrCG7pOeE/E32GSybdmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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