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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74893e7ca37a89618fa10dedfb43ddf6ad675d8f30f8c0598946a15c0be794cd' 
  AND token = 'UAAP6v5oL1mhUv3Dt3ShY3Hp0AnVC22dwuL9/qdaxqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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