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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20714884d432adae6ff3b91905dd4dc43f6f1c61b0f594f9b9a1d65143701752' 
  AND token = '/nlv663g4Nw5ijtGkHID0KY0U7QoDKfKULvpe9XcyCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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