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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992ef3976a8553ace691b82488944bf2d751a76aafd7b0a45917fe72d7ad8b5e' 
  AND token = '5rydI+w8CWLP0n5m4Bxj/ejJcwCZanSZdAsEUReOpyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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