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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1737748100ed532039f339d71034e7d4177656aa78c2f607adedc60a05e0e6fa' 
  AND token = 'EgrdfbMZ0o6vGNG3xep1w7Cnt+klVq8Xld88VM9Wi+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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