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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97d8c1892cd6cc4a094f93c54be6ea39f87a7a820d2504888648f5ca80165f1' 
  AND token = 'Lgu6iU1TEHqOwNvW9JGXbuWADc3EvgpuTfD697ZUPP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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