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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9209e16798a9247eff170c173dbf0d64de7f42a5a874b3dc84dec49f9274e9ee' 
  AND token = 'Yfa/KSydwzoYwjadHgUEckO6wCLJZnY1ffDgRzChH9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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