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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90536fba6405572594da4ef8fcfc3f59f0ee0ec0b484c0366745e69db2a0d334' 
  AND token = '/e6OE3Sf2H8S9mGfPWHjwQHRVZnP127WpZ9KMPFDrmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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