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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfedab91eef74d6a812f10d67337037f8267662775f2abd18451a124af99c2a5' 
  AND token = 'ijc34QLMhd+hzSdKTDpkKHMUMFRSpiXIboCILZQ1LE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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