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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62554b3ee73e685aae7ac9f025dd2e96ac7ac2a0a563a72f5c32663bf4de846b' 
  AND token = 'pLkb7JMfbx+1GGpKe6yHdcoQU1q4K/EkIRbxdcbg+Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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