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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dee9cf0368f260132f984b1ada396fc66d4315450454a95efab8b951a55cf7' 
  AND token = '4sNg0WtuP07MfZ5hBnxQCkAEQ+lzKSEIGhkyo6mKY+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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