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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d7f13e2e32f59d32f03ef55edb0895a88b39c3ecef3cefb7140d6034bc4073' 
  AND token = 'C6WEhR5lwioUpCceerIU1Au17/gP0Hyyc9JAGe07rzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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