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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb8755758a5902894c5ff6034bb57ca8811abfc2d83c069de88c68b39e08713' 
  AND token = '/8Z6WVxovQ1mogVcjM6Axq05qDq9u6MIoMZplgCyUxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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