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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8463fff9b368d7c5f4145d25be06bc3496026ae64925016afa015fabb7a01f' 
  AND token = 'VUSO79yfvK6UbdC2uLuPFf2C+49qwWfwEZYDZJc8J9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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