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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d4cc21a7f741050b62c6a6cfc7da39ef4e7cc1f8afb6e641ac026723f51939' 
  AND token = 'A18PpiTzvDzr0dJeVouRTWep1jXWvh7oCsV+HDCmtGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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