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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa12f399ee6f4ccb9595c3ed1f4e46e6954a3eb89d2ea5beea2081690870921' 
  AND token = 'jcRIIVlffVetfdKhCCMJ4zzduOYJONt0WzAnah79O0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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