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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3c285a329ad5477732aa9484c828a986f6e8cc848d19bfb8864949ef7c4fb4' 
  AND token = 'Zg4Ji9do0S+d/1al2lVzElrRsjf4t3959SMYOVD/U8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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