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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c092154257a44e04a7d076b0254f5f96dc64b9a6683616b755d9acb3857fb7' 
  AND token = 'ktceEl7lV2N0ft23bAfC6lbikQEwmYf9g32noIhqhx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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