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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d012500966d4dc6a36622394bdeb9611f3e1aa79e89814aee911ea089ad0cd' 
  AND token = 'xy/D5YYMrtaKkVX9KDsF71b4duNiJc7UHNlQdilvVDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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