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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac477a10af4c3bd0eb399a588ae680afb69ac1d32f6cf28b8fb4ff1cb5319cf9' 
  AND token = 'UUaBrnJHH2RkUDdiYyXJpL543qC4JBHlCIA47tGtiqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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