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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d50c57d2dcc123d3f0e7f4486dabec4bfebd4d923adfc95d3742aa23af69b9' 
  AND token = '7uP418bME+rhbrfu4l3Uz6y/VNWKQFvK6zeEU6fmRBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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