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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccc68e665c40c23cf60ccc8cdb219025cfd8b817fe49032e28d8dd33c5f19a1' 
  AND token = 'CBX49r7tnhdHjOY+/P3o3070tk6i9/+DnWTmfzyaN3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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