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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc22c134d400dc19d7b0de6f314801a90a81a004601f95e4e4410e2e0347698' 
  AND token = '/FUt02etOnGVcGf9ue+o8imxeoXo1u5MSvpfNSJO+M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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