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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b461bf1aa87fb673929342ed71276caaa41ba75f4d18714eea0e7048f6b762f4' 
  AND token = 'kMcW5+mlwmam0cptiETlWqDBGYqmxEkdXZZ6btxY3rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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