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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f885c5ee3c4cc45d4b60ac5fef523af22db957e13ea44ba375b17c17a3b10a70' 
  AND token = 'qdcJJvstKRnBlNVLB0va/7U1RsGTlAuEjn4neRfFU8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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