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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e013060abb30ad974e7f7665354dd03efc6cfaece6c934600b0792fb9388e0c' 
  AND token = '6J85JdtnPUIkiEqnBKJDV+6pIiE/0XalL/6c11F6790=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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