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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387ecf9f3ab64e681ac14ef8f9a9bf90e3c6e718c6eccfc20b5b7cd6c5756c23' 
  AND token = '6jM3SSJAkQDSfP61L/fIfxysC3xqocYU36ppw5/kQzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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