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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1a9ed0ecf3e8c5d69d2c51e68e5b532694bf90cbbd27699c285b2215ef2bae' 
  AND token = 'YPaQP8DxBkvIpK2EttW5zIQABHh6KBWgi+n+3NS9lMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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