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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63eb0444d09f83dfb5e6e77354430b949aaf10a2e73b13ec24b50f7261484973' 
  AND token = 'oRMvnIvz0fciTrLToFgO+eg6VM+CBjMcgWRcBsr9k+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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