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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df37dd279ba6cf01defdc6dafa69deefb19412bf75349e32c14d09cb96a7e1ce' 
  AND token = 'y0gpEIjsj/FZPdugHc+ne+xmdlz3AQWZu524l4bZY9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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