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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2804c7b7878d37244e6e8a7686d62c27e3926afab971f108fdf22abdc2f9411' 
  AND token = '7BxTtH1TcJGFV+k7FvbV1nYgQutXJhJaxcqWkZBrudY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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