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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6091ed2acb2f8151dcb4ef1f6b9fe3df6df89cbb2b22cd4e77591efe978f41b' 
  AND token = 'pN6QLVhwu4Z4rzeDyn9JThrcIkcJ/mgzBUpqLZT3/54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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