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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd872e73110c379181d5e84e3657408957dd7cf084184ec305d6d7498eadd83f7' 
  AND token = 'a4s+4fg12CrITEtVZ4CIG21wfcI/KKgHON7Y57E3snw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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