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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7bb4101ff3a9afab574655237909726d3c4bb9c27dd861257250f3762079ea' 
  AND token = 'kKx0TMOsSTLN0hAFLCpd5H/5ah4FPy+MiJC8UP/sMDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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