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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407e66383fbc06144afb899f2ee63c6b1135609e8ee3e2fca9aec38e095e9c85' 
  AND token = 'T/bD3mZXHjwKDUoQjtvmnsFQMylkYESVenpolJiHu78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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