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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b724947e97d4cd1b02174aed9f9f8f4478908f1d76a38b54cb6d5fd317bb8835' 
  AND token = 'r2d2t2oQZOmcd9X40vOmfr00K5NV9bR0GMzsSuxL7uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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