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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1189b548bf735abf94787770b5ef5beb35a3c2615efcb8cebe6756966e22172d' 
  AND token = 'RdDbx1yWjZl0DdpCQ1izVKn0GVcUZ1N8I8YPr3WnrOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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