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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752ce7ae69373bae4e3f523b9974b9b13d534830be839486d0a57ac5d88a3486' 
  AND token = 'QWALIrp6tddrcfIayNEewBY7Rrm5OKrFtxeL+qQg8yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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