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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7f3ab561f200147a681039c57758f2d0be31fc5b808a640d3c3f3745acd5ae' 
  AND token = '0RZFMEfM5upclrL34Zo5uiiAhrH0BxzJTfRGx+vJB8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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